US 12,253,750 B2
Liquid crystal handwriting board, handwriting system, and control method for handwriting system
Jiaxing Wang, Beijing (CN); Hao Yan, Beijing (CN); Xiaojuan Wu, Beijing (CN); Hongliang Yuan, Beijing (CN); Jian Wang, Beijing (CN); Yao Bi, Beijing (CN); Jinshuai Duan, Beijing (CN); Yang Ge, Beijing (CN); Zhilong Duan, Beijing (CN); Zhiqiang Yu, Beijing (CN); Xianglei Qin, Beijing (CN); Xiuliang Wang, Beijing (CN); and Xiaofeng Yin, Beijing (CN)
Assigned to Beijing BOE Optoelectronics Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 18/282,985
Filed by Beijing BOE Optoelectronics Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Aug. 22, 2022, PCT No. PCT/CN2022/114041
§ 371(c)(1), (2) Date Sep. 19, 2023,
PCT Pub. No. WO2023/045667, PCT Pub. Date Mar. 30, 2023.
Claims priority of application No. 202111124118.1 (CN), filed on Sep. 24, 2021.
Prior Publication US 2024/0176178 A1, May 30, 2024
Int. Cl. G02F 1/1333 (2006.01); G02F 1/133 (2006.01); G02F 1/1335 (2006.01); G02F 1/1368 (2006.01); G02F 1/139 (2006.01)
CPC G02F 1/13338 (2013.01) [G02F 1/13318 (2013.01); G02F 1/133512 (2013.01); G02F 1/1368 (2013.01); G02F 1/1391 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A liquid crystal handwriting board, comprising: a liquid crystal panel, a photosensitive assembly, and a control assembly; wherein
the liquid crystal panel comprises a first substrate and a second substrate that are opposite, wherein the first substrate comprises a plurality of pixel regions and a plurality of pixel electrodes in the plurality of pixel regions, and the second substrate comprises a common electrode;
the photosensitive assembly comprises a plurality of photosensitive elements, wherein one of the plurality of photosensitive elements corresponds to at least one of the plurality of pixel regions, and an orthogonal projection of each of the plurality of photosensitive elements on the first substrate is at least partially overlapped with the corresponding at least one of the plurality of pixel regions; and
the control assembly is electrically connected to the liquid crystal panel and the photosensitive assembly, and is configured to determine position information of a pixel region for erasure by detecting position information of target light irradiated to the liquid crystal panel by the photosensitive assembly and supply a pixel voltage to the plurality of pixel electrodes in the pixel region for erasure, such that a voltage difference is present between the plurality of pixel electrodes in the pixel region for erasure and the common electrode,
wherein the photosensitive assembly is disposed on a side, distal from the second substrate, of the first substrate,
the liquid crystal handwriting board further comprising:
a black matrix, wherein the black matrix is disposed between the plurality of pixel electrodes and the plurality of photosensitive elements, and a plurality of light apertures are defined in the black matrix, wherein the plurality of light apertures are in one-to-one correspondence to the plurality of pixel regions, an orthogonal projection of each of the plurality of light apertures on the first substrate is within the corresponding pixel region, each of the plurality of photosensitive elements corresponds to at least one of the plurality of light apertures, and the orthogonal projection of each of the plurality of light apertures on the first substrate is at least partially overlapped with an orthogonal projection of the corresponding photosensitive element on the first substrate.